CPT原子钟微波信号的设计和分析  

The Design and Analysis of Microwave Signals for CPT Atomic Clock

作　　者：陈杰华[1] 杜润昌[1] 王远超[1] 刘朝阳[1] 顾思洪[1] 

机构地区：[1]中国科学院武汉物理与数学研究所,武汉430071

出　　处：《宇航计测技术》2010年第2期60-63,共4页Journal of Astronautic Metrology and Measurement

基　　金：国家自然科学基金(No.10574141);武汉光电国家实验室创新基金(No.Z080005)资助项目

摘　　要：根据被动型相干布居囚禁原子钟对微波信号的要求,利用小数分频锁相环技术实现了微波频率综合,并通过优化环路带宽得到最佳的输出相噪。测试结果表明:3 417 MHz微波输出在100 Hz处的相位噪声达到-80 dBc;中心频率±50 kHz范围内的杂散抑制达到54 dB,都接近于理论值。将产生的微波用于所研制的CPT原子钟,获得频率稳定度达到1 000 s内6×10-11-1/2,为目前国外商品钟水平。In accordance with the requirement to microwave signal by the tion Trapping （CPT） atomic clock, microwave frequency synthesis is realized passive through Coherent Populafractional-N PLL technology, and best phase noise of the microwave is obtained by optimizing the loop width. Measurement results show that the achieved phase noise of the 3 417 MHz microwave is -80 dBc at 100 Hz and the spur suppression is 54 dB in ± 50 kHz scope, both are close to the theoretical values. The realized microwave is applied to our developed CPT atomic clock, and the short term frequency stability 6×10^-11ι -1/2, which is the best frequency stability of present commercial CPT atomic clock,is obtained.

关 键 词：原子钟 微波 小数分频 锁相环 相位噪声 

分 类 号：TP935.115[自动化与计算机技术]